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September Weather in Welland, Canada

Last updated: June 18, 2025

In September, the average temperature in Welland, Canada is a comfortable 19°C (66°F). Expect minimum temperatures to drop to 9°C (49°F), while the high can reach a warm 28°C (83°F). During this time, you may encounter approximately 80 mm (3.2 in) of precipitation spread over 9 days. Additionally, the average humidity sits at a moderate 76%, creating a pleasant yet slightly humid atmosphere.

September Temperature in Welland

In September in Welland, the average temperature is 19°C (66°F), with maximums reaching up to 28°C (83°F) and minimums dropping as low as 9°C (49°F). It's a great time to explore the outdoors while enjoying mild weather, so pack accordingly for both warm days and cooler evenings.

September Weather in Welland: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Welland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Welland, September typically has an average temperature of 19°C (66°F), with highs reaching up to 28°C (83°F) and lows dropping to around 9°C (49°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934425465727266564235
Data source: Temperature data for Welland generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Welland

In Welland in September, the total precipitation amount is 80 mm (3.2 in) over the course of 9 days.

September Precipitation Trends in Welland

The chart displays monthly precipitation patterns in Welland, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Welland, September typically receives around 80 mm (3.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7985771181048412485801339293
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Welland

In Welland in September, humidity is 76%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making travel mildly uncomfortable and encouraging frequent breaks in shaded or air-conditioned areas.

September Average Humidity in Welland

This chart illustrates the average monthly humidity levels in Welland, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Welland is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Welland

In Welland in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Welland.

Maximum UV Index Levels in Welland for September

The chart shows the monthly maximum UV Index (UVI) for Welland in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Welland typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
Data source: Welland September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Welland Compares to Other Months

Weather in Welland varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Welland, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Welland, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)79 mm (3.1 inches)91%low
February Weather-2°C (29°F)85 mm (3.4 inches)91%moderate
March Weather1°C (34°F)77 mm (3.0 inches)88%moderate
April Weather6°C (43°F)118 mm (4.6 inches)88%very high
May Weather12°C (54°F)104 mm (4.1 inches)82%very high
June Weather18°C (65°F)84 mm (3.3 inches)79%very high
July Weather22°C (73°F)124 mm (4.9 inches)77%very high
August Weather22°C (72°F)85 mm (3.4 inches)72%very high
September Weather19°C (66°F)80 mm (3.2 inches)76%high
October Weather13°C (56°F)133 mm (5.2 inches)83%moderate
November Weather6°C (42°F)92 mm (3.6 inches)88%moderate
December Weather1°C (35°F)93 mm (3.7 inches)87%low

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